Home / 1,340.21-2,011.20-609.80

Finding the Fourth Proportional to 1,340.21, 2,011.20 and 609.80

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Solution

The fourth proportional to 1,340.21, 2,011.20 and 609.80 is: 915.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.21 : 2,011.20 = 609.80 : x
  2. Step 2: Convert to fraction form
    1,340.21/2,011.20 = 609.80/x
  3. Step 3: Cross multiply
    1,340.21x = 2,011.20 × 609.80
  4. Step 4: Simplify right side
    1,340.21x = 1,226,429.76
  5. Step 5: Solve for x
    x = 1,226,429.76/1,340.21
  6. Step 6: Final answer
    x = 915.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.